1N8Q:
reference: Lipoxygenase interactions with natural flavonoid, quercetin, reveal a complex with protocatechuic acid in its X-ray structure at 2.1 A resolution., Borbulevych OY, Jankun J, Selman SH, Skrzypczak-Jankun E, Proteins 2004 Jan 1;54(1):13-9. PMID: 14705020

This OCA Structure page
uses Jmol, developed by the Jmol Development Team (documentation).